using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var map = NArr(n);
        var bitmax = 1 << n;
        var INF = 10000;
        var dp = new int[bitmax, n];
        for (var b = 0; b < bitmax; ++b) for (var i = 0; i < n; ++i) dp[b, i] = INF;
        for (var i = 0; i < n; ++i) dp[1 << i, i] = 0;
        for (var b = 1; b < bitmax; ++b)
        {
            for (var i = 0; i < n; ++i)
            {
                if ((b & (1 << i)) == 0) continue;
                for (var j = 0; j < n; ++j)
                {
                    var next = b | (1 << j);
                    if (b == next) continue;
                    dp[next, j] = Math.Min(dp[next, j], Math.Max(dp[b, i], map[i][1] - map[i][0] + map[j][0]));
                }
            }
        }
        var ans = INF;
        for (var i = 0; i < n; ++i) ans = Math.Min(ans, dp[bitmax - 1, i]);
        WriteLine(ans);
    }
}